Here is the link to all our John Lewis Curve Kitchen Tap Parts.Note on the Grub screw included with the O Ring Kit: The grub screw takes a 2.5mm allen key. Please retain your existing grub screw in case it is an earlier version in which case you will need to use your existing grub screw. This O Ring Kit covers several different UK Kitchen Taps so you might not require all the O Rings provided in the Kit.